(31$ ) 
other Jfiqyiries Coticmntig the Sea. / 
The FuhUfhtr O^ thefe Tracts^ knowing, that the Honorable Robert Bojle 
had not left unconfidered the Natural Hitlory of the Se^l,o^ which Snbjcd 
the late, and thefe prefent Papers, have entertained the Reader as to £he 
Obfervables of its FIpix and Reflux He was on this occaiion inftanc, wuh 
that Gentleman to impart to him, for pub'icacion, ihefe Heads of Inquiries, 
he had drawn up, touching that Subjed : Which having obtained ( though 
the AmhordcCnhs^ they may be lookc upon as unfiniftit ) he thus fubjbyns. 
What is the proportion of Salt, that is in the Water of differing Seas ; 
And whether in the fame Sea it be always the farne ? And if it be not, how 
much it differs ? 
i What is the Gravity of Sea- waters in reference to Frefh Waters and to one 
another : Whether it vary not in Summer and Winter,and on other Scores ? 
And whether in the fimeSeafon its Gravity proceed only from the greater or 
leffer Proportion of Salt, that is in it, and not fometimes from other Cau- 
fes i And what are the differing GravL-ies of the Sea water, according to 
theClimats,*' 
What are the Oddrs, Colours chufe commmng a difficult Qujere 
and Tafts, obfervable in Sea- "^^^.'^f ^^y fi^^;fomcthmg odd, Mr, Boyl 
ui'\ter> thml^spt to not 9, that having recommended this 
, , . 1 J 1. r L matter, among others, to a learned ^hyfnian, that ■ 
What IS the depth of the Sea wasfMilingimo America, and fmmjhed him with 
in fever al places, and the Order « yw^i// Hydroftaticall inlirument^ to obf'er've 
Oi its increafe and Decremenrs i^^*^ '^^^ ^^f^^^ Differences of Garvity he 
And whether the Bottom of the rt'Tf'^'f/ 
J , ,r . . That hf found hy the Gla s.the Sea-vfater to W' 
bea does always nie towards the creafi in weight, the nearer be came to the Line, 
SJVOre, unlefs accidentally in- till he arrived at m certain Degree of t&mude ; 
CCrropted f remsmhrs, it ivas about the 30th ,* after 
Of the Bottom of the Sea '^^^<^J^* ^f^^Watex/eerned to r the fame fpe^ 
amiiie^Mt differs from the Sur! jf^^i^r^^' ''^ ^'"^ r^e Barbadoe., or ^ 
face of the Earth, in reference 
to the Soyf , n,:i Evennefs or Roughnefs of the Superficies - And the Stonet, 
Minerals ^nd i'etegablestobefburd there? 
What the Figoratien of the Seas from North to South, and from E2& to 
Weft, and in the feveral Hemifphcres and Glimats f 
What communication there is of Seas by Streights and Subtcrraneal 
Conveyances? 
Of^he Motion of the Sea by Winds^ and how far Storms reach downwards 
towards the Bottom of the Sea ^ * 
Of the grand Motions of the Bulk or Body of the Sea • cfpecially of the 
Tides ; Their Hiftory as to iheirNaiure and Differences, 
The-. 
